The thermostat is a snap action. It is either completely on or completely off. The combination valve may be letting a little extra gas pass by the main valve. Unless it is a significient amount of flame or it continues for more than a minute or two, just keep an eye on it. It is not unusual to see a tiny flame at the orifice, but it usually dies out in less than a minute or so. You can get a rebuild kit for the gas valve. The complete valve is around $150.00. You will need to get the model number and the serial number of the fryer, to buy either the valve or the rebuild kit. If you are very confident in your abilities to do a gas valve rebuild it should take a couple of hours to remove the valve by removing the main gas line, then the manifold that runs to the burners. You will also have to remove the wires that run to the high limit switch and thermostats. Be sure to mark the wires as you remove them. The gaskets are very fragile. As you take the valve apart lay everything in order so that you may retrace your steps in putting it back together. There is an exploded view of the valve in the rebuild kit. You MUST check for gas leaks before lighting the fryer after you have rebuilt the valve. With the gas pressure on, but the pilot not lit, spray the entire valve with liquid leak detector, available at the same place you get the rebuild kit. You can also use dishwashing liquid, but either way look for bubbles at all the gasket locations as well as the gas pipes and manifold that you removed. If you see ANY bubbles, don't light the pilot. Start over with new gaskets. Hope this helps
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The thermostat is a snap action. It is either completely on or completely off. The combination valve may be letting a little extra gas pass by the main valve. Unless it is a significient amount of flame or it continues for more than a minute or two, just keep an eye on it. It is not unusual to see a tiny flame at the orifice, but it usually dies out in less than a minute or so. You can get a rebuild kit for the gas valve. The complete valve is around $150.00. You will need to get the model number and the serial number of the fryer, to buy either the valve or the rebuild kit. If you are very confident in your abilities to do a gas valve rebuild it should take a couple of hours to remove the valve by removing the main gas line, then the manifold that runs to the burners. You will also have to remove the wires that run to the high limit switch and thermostats. Be sure to mark the wires as you remove them. The gaskets are very fragile. As you take the valve apart lay everything in order so that you may retrace your steps in putting it back together. There is an exploded view of the valve in the rebuild kit. You MUST check for gas leaks before lighting the fryer after you have rebuilt the valve. With the gas pressure on, but the pilot not lit, spray the entire valve with liquid leak detector, available at the same place you get the rebuild kit. You can also use dishwashing liquid, but either way look for bubbles at all the gasket locations as well as the gas pipes and manifold that you removed. If you see ANY bubbles, don't light the pilot. Start over with new gaskets. Hope this helps